Composite nonwoven fabric shoe material midsole and preparation method thereof

Abstract

The application discloses a composite non-woven fabric shoe material insole and a preparation method thereof, relates to the technical field of shoe material insoles, and discloses the following components in percentage by weight: 15% fiber pulp, 15% virgin wood pulp, 25% wet strength paper, 20% cotton, and 25% cigarette card. The preparation method comprises the following steps: raw material mixing, raw material conveying, glue agent adding, wet strength agent adding, squeezing, drying, polishing, printing, and cutting. The pulper comprises a connecting frame, a raw material box, a feeding mechanism connected with the raw material box, and a pulping device connected to the feeding mechanism, and the pulping device is connected with a water source. The pulping device comprises a shell located on one side of the feeding mechanism, a crushing mechanism, and a stirring mechanism, the stirring mechanism is located below the crushing mechanism, and the application has the characteristics of good processing quality and high working efficiency.

Description

Technical Field

[0001] This application relates to the field of shoe material insole technology, specifically to a composite nonwoven shoe material insole and its preparation method. Background Technology

[0002] The insole of footwear is mainly made from wood pulp. As the demand for insole materials increases, the demand for wood pulp also gradually increases. However, wood pulp is made from wood, so its production consumes a lot of forest resources and can easily disrupt the balance of the ecosystem. Therefore, using secondary fibers to replace wood pulp can not only adapt to the production of footwear materials, but also improve the protection of the environment.

[0003] Secondary fibers require processes such as mixing, crushing, and stirring. However, current technologies cannot simultaneously meet the three functions of mixing, stirring, and crushing in the processing of secondary fibers. Therefore, it is necessary to improve existing crushing equipment. Summary of the Invention

[0004] In view of this, this application provides a composite nonwoven shoe material insole plate and its preparation method to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A composite nonwoven shoe material insole comprises the following components by weight percentage: 15% fiber pulp, 15% virgin wood pulp, 25% wet strength paper, 20% cotton, and 25% cigarette card.

[0006] This invention also provides a method for preparing a midsole plate for composite nonwoven shoe materials, comprising the following steps: Step S1, Raw material mixing: Mix the raw materials (15% fiber pulp, 15% virgin wood pulp, 25% wet strength paper, 20% cotton, 25% cigarette card) using a pulper; Step S2, Raw material conveying: Pump the mixed liquid from step S1 into the slurry tank; Step S3, Add sizing agent: Add sizing agent to the pulp forming tank at a dosage of 0.5% of the pulp for preliminary internal sizing; Step S4, adding wet strength agent: add wet strength agent to the front box of the net, the amount of which is 0.5% of the pulp, to obtain a mixture; Step S5, pressing: The mixture from step S4 is sent to the pressing process via a conveying mechanism for pressing to obtain the pressed mixture; Step S6, Drying: The pressed mixture from step S5 is conveyed to a dryer for drying; Step S7, Calendering: Enter the calender for hard calendering; Step S8, Printing: Print the desired pattern using a printing press; Step S9, Cutting: Cut the shoe midsole to the required size using a paper cutter.

[0007] Furthermore, the pulper includes: Connector; Raw material box; A feeding mechanism connected to the raw material box; A pulping device connected to the feeding mechanism, wherein the pulping device is connected to an external water source; The pulping device includes a housing located on one side of the feeding mechanism, and a crushing mechanism and a stirring mechanism both mounted on the housing, with the stirring mechanism located below the crushing mechanism.

[0008] Furthermore, the feeding mechanism includes: A connecting cylinder connected inside the raw material box; A first electric motor installed on top of the connecting cylinder; A rotating rod connected to the output end of the first motor, the rotating rod being located inside the connecting cylinder; Helical blades are mounted on the rotating rod.

[0009] Furthermore, the lower end of the connecting cylinder is provided with a feed inlet, the lower end of the spiral blade extends to the feed inlet, and the upper end of the connecting cylinder is provided with a discharge outlet extending into the housing.

[0010] Furthermore, the crushing mechanism includes: The first crushing roller is mounted inside the housing via a fixing frame; The second crushing roller, the movable frame of the second crushing roller is slidably disposed in the housing via a movable component; A first crushing motor connected to the first crushing roller; A second crushing motor is connected to the second crushing roller, and the first crushing motor and the second crushing motor can drive the first crushing roller and the second crushing roller to rotate relative to each other.

[0011] Furthermore, the moving component includes: A connecting box installed inside the housing; The track is installed inside the connecting box; A rack that slides in conjunction with the track; A connecting rod hinged between the rack and the movable frame; Guide rods connected to the movable frame; A compression spring connecting the guide rod and the connecting box; The rack is meshed with the gear driven by the second electric motor.

[0012] Furthermore, the connecting box is also provided with a guide cylinder that slides with the guide rod, and the compression spring is connected between the guide rod and the guide cylinder.

[0013] Furthermore, the stirring mechanism includes: A third electric motor is installed at the bottom of the housing; A stirring shaft connected to the output end of the third motor enters the housing and extends upward; Several stirring blades are mounted in a ring on the stirring shaft; A cutter is mounted on the stirring shaft, and the cutter is positioned above the stirring blades; A plurality of scrapers are annularly mounted on the stirring shaft, the scrapers abutting against the inner wall of the housing, and the scrapers are located below the first crushing roller and the second crushing roller.

[0014] Furthermore, it also includes a water pump, which is connected to an inlet pipe and an outlet pipe. The inlet pipe extends into the water tank, and the outlet pipe is connected to a spray head, which is located inside the housing.

[0015] As can be seen from the above technical solution, the advantages of the present invention are: 1. In this application, mixing, crushing and stirring can be combined, reducing the transfer process and time required when processing separately, which is not only convenient to operate, but also more efficient in processing.

[0016] 2. The pulping device in this application includes a crushing mechanism and a stirring mechanism. The crushing force of the crushing mechanism can be adjusted, and the stirring mechanism can further improve the crushing effect. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0018] Figure 1 This is a schematic diagram of the structure of this application.

[0019] Figure 2 for Figure 1 A magnified view of part A.

[0020] Figure 3 for Figure 1 A magnified view of section B.

[0021] Figure 4 for Figure 1 A magnified view of a portion of point C.

[0022] Figure 5 for Figure 1 A magnified view of a portion of point D.

[0023] List of reference numerals: 1. Ground; 2. Water tank; 21. Clear water; 22. Cover plate; 23. Handle; 3. Water pump; 31. Inlet pipe; 31. Filter screen; 311. Outlet pipe; 32. Fixture; 33. Spray head; 34. Connecting frame; 4. Raw material box; 5. Feeding mechanism; 6. First motor; 61. Connecting cylinder; 62. Inlet; 621. Outlet; 622. Rotating rod; 63. Spiral blade; 64. Pulverizing device; 7. Housing; 71. Top cover; 711. Support leg; 72. Stop block; 73. Crushing mechanism; 74. First crushing roller; 741. Fixing frame; 7411. The components include: a first crushing motor 7412, a second crushing roller 742, a moving frame 7421, a second crushing motor 7422, a guide rod 743, a guide cylinder 7431, a compression spring 7432, a connecting box 744, a second motor 745, a gear 746, a rack 747, a track 748, a connecting rod 749, a stirring mechanism 75, a third motor 751, a stirring shaft 752, a connecting sleeve 753, a stirring blade 754, a through hole 7541, a connecting rod 755, a scraper 756, a cutter 757, and a discharge pipe 76. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and their descriptions are used to explain this application, but are not intended to limit it.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly. The connection can be a direct connection or an indirect connection.

[0026] Furthermore, the terms "first" and "second" are merely used to distinguish between descriptions and have no special meaning.

[0027] This embodiment provides a composite nonwoven shoe material insole, comprising the following components by weight percentage: 15% fiber pulp, 15% virgin wood pulp, 25% wet strength paper, 20% cotton, and 25% tobacco card.

[0028] refer to Figures 1 to 5 This embodiment also provides a method for preparing a midsole plate for composite nonwoven shoe materials, including the following steps: Step S1, Raw material mixing: Mix the raw materials (15% fiber pulp, 15% virgin wood pulp, 25% wet strength paper, 20% cotton, 25% cigarette card) using a pulper; Step S2, Raw material conveying: Pump the mixed liquid from step S1 into the slurry tank; Step S3, Add sizing agent: Add sizing agent (dispersible loose sizing agent) to the slurry tank at a dosage of 0.5% of the slurry to perform preliminary internal sizing to improve water resistance; Step S4, Adding wet strength agent: Add wet strength agent (cationic polyacrylamide) to the front box, with a dosage of 0.5% of the pulp, to ensure that the paperboard has a certain wet strength and obtain a mixture; Step S5, pressing: The mixture from step S4 is sent to the pressing process via a conveying mechanism for pressing to obtain the pressed mixture; Step S6, Drying: The pressed mixture from step S5 is conveyed to a dryer for drying; Step S7, Calendering: Enter the calender for hard calendering; Step S8, Printing: Print the desired pattern using a printing press; Step S9, Cutting: Cut the shoe midsole to the required size using a paper cutter.

[0029] In step S5, the pressing process includes: vacuum pressing upper and lower rollers, guide rollers at the dip-inlet and outlet, pre-pressing upper and lower rollers, and main pressing upper and lower rollers, to perform vacuum pressing, dip-in, pre-pressing, and main pressing.

[0030] In step S5, the pressing working pressure is 20KN / m-50KN / m.

[0031] In step S6, the dryer has a maximum operating pressure of 0.9 MPa and a surface roughness of ≤0.3 micrometers.

[0032] The shoe material insole plate produced by the embodiments of this application is not only low in cost, but also has very good conformability to meet various shoe processing procedures. In addition, it has good breathability, waterproofness, adhesion and bending resistance, making it more practical.

[0033] like Figure 1As shown, compared to existing pulping equipment that requires separate mixing, crushing, and stirring of raw materials, resulting in numerous processing steps and low efficiency, this application combines mixing, crushing, and stirring, thereby reducing material conveying during processing and achieving higher efficiency. Furthermore, in this application, the crushing effect can be adjusted according to the size of the raw materials. Compared to existing equipment that cannot adjust the crushing effect, this application offers better crushing performance. The pulper includes: a water pump 3, a connecting frame 4, a raw material box 5, a feeding mechanism 6, and a pulping device 7. The feeding mechanism 6 is connected to the raw material box 5. The pulping device 7 is connected to the right side of the feeding mechanism 6, and the pulping device 7 is connected to an external water source. The pulping device 7 includes a housing 71, a crushing mechanism 74, and a stirring mechanism 75. The housing 71 is located on the right side of the feeding mechanism 6. The crushing mechanism 74 and the stirring mechanism 75 are both installed on the housing 71, and the stirring mechanism 75 is located below the crushing mechanism 74. The water pump 3 is connected to an inlet pipe 31 and an outlet pipe 32. The lower end of the inlet pipe 31 extends into the water tank 2, and the upper end of the outlet pipe 32 is connected to a spray head 34, which extends into the housing 71.

[0034] Preferably, in this embodiment of the application, the water tank 2 is dug on the ground 1 and is recessed downwards. The water tank 2 contains clean water 21, which is used to stir and mix 15% fiber pulp, 15% virgin wood pulp, 25% wet strength paper, 20% cotton and 25% tobacco card.

[0035] Preferably, in some embodiments, the top of the pool 2 is covered with a cover plate 22 for dust prevention and sealing.

[0036] Preferably, in this embodiment of the application, a handle 23 is installed on the top of the cover plate 22 to facilitate the removal of the cover plate 22.

[0037] Preferably, in this embodiment of the application, the lower end of the water inlet pipe 31 passes through the cover plate 22 and extends into the water tank 2.

[0038] Preferably, in this embodiment of the application, the lower end of the water inlet pipe 31 is provided with a filter screen 311, which can filter and adsorb the clean water 21, thereby making the clean water 21 cleaner.

[0039] Preferably, in this embodiment of the application, in order to improve the installation stability of the water outlet pipe 32, the water outlet pipe 32 is connected to the side and top surface of the connecting frame 4 by multiple fasteners 33.

[0040] like Figure 1 and Figure 3As shown, the feeding mechanism 6 includes: a connecting cylinder 62, a first motor 61, a rotating rod 63, and a spiral blade 64. The lower end of the connecting cylinder 62 is connected to the raw material box 5; the first motor 61 is installed on the top of the connecting cylinder 62; the rotating rod 63 is connected to the output end of the first motor 61 and is located inside the connecting cylinder 62; the spiral blade 64 is disposed on the rotating rod 63.

[0041] In this embodiment of the application, the lower end of the connecting cylinder 62 is provided with a feed inlet 621, which communicates with the raw material box 5. The lower end of the spiral blade 64 extends to the feed inlet 621. The upper end of the connecting cylinder 62 is provided with a discharge outlet 622, which extends into the housing 71.

[0042] In this embodiment, the raw materials (including 15% fiber pulp, 15% virgin wood pulp, 25% wet strength paper, 20% cotton and 25% cigarette card) are stored in the raw material box 5. The first motor 61 is started, which causes the rotating rod 63 to drive the spiral blade 64 to rotate. The spiral blade 64 moves upward in a spiral manner, thereby conveying the raw materials upward and finally entering the housing 71 through the discharge port 622.

[0043] like Figure 1 and Figure 4 As shown, the crushing mechanism 74 includes: a first crushing roller 741, a second crushing roller 742, a first crushing motor 7412, and a second crushing motor 7422. The first crushing roller 741 is mounted inside the housing 71 via a fixing frame 7411. The movable frame 7421 of the second crushing roller 742 is slidably disposed inside the housing 71 via a movable component. The first crushing motor 7412 is connected to the first crushing roller 741. The second crushing motor 7422 is connected to the second crushing roller 742. The first crushing motor 7412 and the second crushing motor 7422 cooperate to drive the first crushing roller 741 and the second crushing roller 742 to rotate relative to each other.

[0044] In this embodiment of the application, the first crushing motor 7412 and the second crushing motor 7422 are started, causing the first crushing roller 741 and the second crushing roller 742 to rotate relative to each other, thereby crushing the raw materials.

[0045] Preferably, in this embodiment of the application, the first crushing roller 741 and the second crushing roller 742 rotate relative to each other.

[0046] Preferably, in this embodiment of the application, the top of the housing 71 is sealed with a top cover 711, and the spray head 34 extends into the housing 71 after passing through the top cover 711.

[0047] Preferably, in this embodiment of the application, a plurality of baffles 73 are provided on the inner wall of the housing 71. The plan view of the baffles 73 is triangular. The baffles 73 are located on the lower right side of the discharge port 622. The baffles 73 guide the raw material so that it falls between the first crushing roller 741 and the second crushing roller 742 after entering the housing 71, so that the first crushing roller 741 and the second crushing roller 742 can cooperate to crush the raw material.

[0048] like Figure 4 As shown, the moving assembly includes: a connecting box 744, a track 748, a rack 747, a connecting rod 749, a guide rod 743, a compression spring 7432, and a gear 746. The connecting box 744 is installed inside the housing 71; the track 748 is installed inside the connecting box 744; the rack 747 is slidably engaged with the track 748; the connecting rod 749 is hinged between the rack 747 and the moving frame 7421; the guide rod 743 is connected to the moving frame 7421; the compression spring 7432 is connected between the guide rod 743 and the connecting box 744; the gear 746 is driven by a second motor 745, and the rack 747 is meshed with the gear 746.

[0049] In this embodiment of the application, the connecting box 744 is further provided with a guide cylinder 7431, the guide rod 743 is slidably engaged with the guide cylinder 7431, and the compression spring 7432 is connected between the guide rod 743 and the guide cylinder 7431.

[0050] In this embodiment, the second motor 745 starts, causing the gear 746 to rotate and drive the rack 747 to move horizontally. When the rack 747 moves to the right, the connecting rod 749 pulls the moving frame 7421 to the right, thus moving the second crushing roller 742 to the right. At this time, the distance between the second crushing roller 742 and the first crushing roller 741 increases, which can be used to crush larger raw materials. Conversely, when the rack 747 moves to the left, the connecting rod 749 pulls the moving frame 7421 to the left, thus moving the second crushing roller 742 to the left. At this time, the distance between the second crushing roller 742 and the first crushing roller 741 decreases, which can be used to crush smaller raw materials. With the cooperation of the first crushing roller 741 and the second crushing roller 742, the raw material squeezes the movable second crushing roller 742. Therefore, the reaction force of the compression spring 7432 increases the force between the second crushing roller 742 and the raw material, resulting in a better crushing effect.

[0051] Preferably, in this embodiment of the application, when the second motor 745 rotates forward, the rack 747 will move to the right, and when the second motor 745 rotates in reverse, the rack 747 will move to the left. Regardless of whether the second motor 745 rotates forward or in reverse, the adjustment range of the guide rod 743 is limited, so that the right end of the guide rod 743 abuts against the left end of the compression spring 7432, that is, the compression spring 7432 is in a compressed state.

[0052] like Figure 5 As shown, the stirring mechanism 75 includes: a third motor 751, a stirring shaft 752, a plurality of stirring blades 754, a cutting blade 757, and a plurality of scrapers 756. The third motor 751 is installed at the bottom of the housing 71. The stirring shaft 752 is connected to the output end of the third motor 751, and the stirring shaft 752 enters the housing 71 and extends upward. The plurality of stirring blades 754 are annularly mounted on the stirring shaft 752. The cutting blade 757 is mounted on the stirring shaft 752 and is located above the stirring blades 754. The plurality of scrapers 756 are annularly mounted on the stirring shaft 752, and the scrapers 756 abut against the inner wall of the housing 71. The scrapers 756 are located below the first crushing roller 741 and the second crushing roller 742.

[0053] Preferably, in this embodiment of the application, a connecting sleeve 753 is fitted on the stirring shaft 752, and a plurality of stirring blades 754 are circumferentially connected to the connecting sleeve 753.

[0054] Preferably, in this embodiment of the application, the stirring blade 754 is provided with a plurality of through holes 7541, so as to improve the flowability between the stirring blade 754 and the raw material, thereby making the stirring effect better.

[0055] Preferably, in this embodiment of the application, the stirring shaft 752 is further provided with a plurality of annularly distributed connecting rods 755, and the scraper 756 is connected to the corresponding connecting rods 755. The scraper 756 can not only improve the stirring effect, but also scrape off the raw materials adhering to the inner wall of the shell 71, thereby making the stirring effect better.

[0056] Preferably, in this embodiment of the application, a discharge pipe 76 is provided on the lower right side of the shell 71. The discharge pipe 76 is controlled by a valve. After the mixture is well stirred, the valve is operated to open the discharge pipe 76, and the mixed raw materials can be discharged.

[0057] Preferably, in this embodiment of the application, the bottom of the housing 71 is supported by a support leg 72, which can improve the stability and shock absorption of the housing 71.

[0058] Working principle: Raw materials (15% fiber pulp, 15% virgin wood pulp, 25% wet strength paper, 20% cotton, and 25% cigarette card) are stored in the raw material box 5. The first motor 61 is started, causing it to feed the material into the housing 71 through the discharge port 622. Then, the first crushing motor 7412 and the second crushing motor 7422 are started, causing the first crushing roller 741 and the second crushing roller 742 to rotate relative to each other, thereby crushing the raw materials. During this process, the water pump 3 is started, causing a set amount of clean water 21 to be pumped in. The material is fed into the housing 71. The distance between the first crushing roller 741 and the second crushing roller 742 is preset by controlling the second motor 745. The crushed material falls downward into the stirring mechanism 75 between the first crushing roller 741 and the second crushing roller 742. The third motor 751 is started, which makes the stirring blade 754 and the scraper 756 rotate, thereby stirring and mixing the material. The scraper 756 scrapes off the material adhering to the inner wall of the housing 71. After stirring, the discharge pipe 76 is opened to discharge the material.

[0059] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to the embodiments of this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for preparing a composite nonwoven shoe material insole, characterized in that, The raw materials used to make the insole of this composite nonwoven shoe material include the following components by weight percentage: 15% fiber pulp, 15% virgin wood pulp, 25% wet strength paper, 20% cotton, and 25% tobacco card. The preparation method of the composite nonwoven shoe material insole includes the following steps: Step S1, Raw material mixing: Mix the raw materials using a pulper; Step S2, Raw material conveying: Pump the mixed liquid from step S1 into the slurry tank; Step S3, Add sizing agent: Add sizing agent to the pulp forming tank at a dosage of 0.5% of the pulp for preliminary internal sizing; Step S4, adding wet strength agent: add wet strength agent to the front box of the net, the amount of which is 0.5% of the pulp, to obtain a mixture; Step S5, pressing: The mixture from step S4 is sent to the pressing process via a conveying mechanism for pressing to obtain the pressed mixture; Step S6, Drying: The pressed mixture from step S5 is conveyed to a dryer for drying; Step S7, Calendering: Enter the calender for hard calendering; Step S8, Printing: Print the desired pattern using a printing press; Step S9, Cutting: Cut the shoe midsole to the required size using a paper cutter; The pulper includes: Connector (4); Raw material box (5); A feeding mechanism (6) connected to the raw material box (5); A pulping device (7) is connected to the feeding mechanism (6), and the pulping device (7) is connected to an external water source; The pulping device (7) includes a housing (71) located on one side of the feeding mechanism (6), and a crushing mechanism (74) and a stirring mechanism (75) both mounted on the housing (71), with the stirring mechanism (75) located below the crushing mechanism (74); The crushing mechanism (74) includes: The first crushing roller (741) is mounted inside the housing (71) by a fixing frame (7411). The second crushing roller (742) has a movable frame (7421) slidably disposed within the housing (71) via a movable assembly. The movable assembly includes: a connecting box (744) installed within the housing (71); a track (748) installed within the connecting box (744); a rack (747) slidably engaged with the track (748); a connecting rod (749) hinged between the rack (747) and the movable frame (7421); a guide rod (743) connected to the movable frame (7421); and a connecting rod (749) connected to the guide rod. The compression spring (7432) between the rod (743) and the connecting box (744), the gear (746) driven by the second motor (745), the first crushing motor (7412) connected to the first crushing roller (741), and the second crushing motor (7422) connected to the second crushing roller (742), the rack (747) meshing with the gear (746), the first crushing motor (7412) and the second crushing motor (7422) can drive the first crushing roller (741) and the second crushing roller (742) to rotate relative to each other; The feeding mechanism (6) includes: Connecting cylinder (62) inside the raw material box (5); A first electric motor (61) is installed on top of the connecting cylinder (62); A rotating rod (63) is connected to the output end of the first motor (61), and the rotating rod (63) is located inside the connecting cylinder (62); The spiral blade (64) is provided on the rotating rod (63); The lower end of the connecting cylinder (62) is provided with a feed inlet (621), the lower end of the spiral blade (64) extends to the feed inlet (621), and the upper end of the connecting cylinder (62) is provided with a discharge outlet (622) extending into the housing (71).

2. The method for preparing the composite nonwoven shoe material insole plate according to claim 1, characterized in that, The connecting box (744) is also provided with a guide cylinder (7431) that slides with the guide rod (743), and the compression spring (7432) is connected between the guide rod (743) and the guide cylinder (7431).

3. The method for preparing the composite nonwoven shoe material insole plate according to claim 1, characterized in that, The stirring mechanism (75) includes: A third electric motor (751) is installed at the bottom of the housing (71). A stirring shaft (752) is connected to the output end of the third motor (751), the stirring shaft (752) enters the housing (71) and extends upward; A plurality of stirring blades (754) are annularly mounted on the stirring shaft (752); A cutter (757) is mounted on the stirring shaft (752), the cutter (757) being located above the stirring blade (754); A plurality of scrapers (756) are annularly mounted on the stirring shaft (752), the scrapers (756) abutting against the inner wall of the housing (71), and the scrapers (756) are located below the first crushing roller (741) and the second crushing roller (742).

4. The method for preparing the composite nonwoven shoe material insole plate according to claim 1, characterized in that, It also includes a water pump (3), which is connected to an inlet pipe (31) and an outlet pipe (32). The inlet pipe (31) extends into the water tank (2), and the outlet pipe (32) is connected to a spray head (34), which is located inside the housing (71).

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